CN107918822B - Method for evaluating output lifting capacity of steam turbine in nuclear power plant - Google Patents
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Abstract
The invention provides a method for evaluating the output lifting capacity of a steam turbine in a nuclear power plant, which comprises the following steps: step S1, setting the output lifting capacity of the steam turbine; step S2, according to the set turbine output lifting capacity and the turbine output lifting principle, predicting the change of a plurality of key parameters of the steam generator and the turbine related to the lifting principle when the output lifting capacity is realized; step S3, analyzing the conditions required to be met by other key parameters related to the lifting principle according to the key parameter change estimated in the step S2; and step S4, judging whether the values of the other parameters calculated according to the actual operation data of the power plant meet the analysis conditions in the step S3, if so, indicating that the actual operation state of the power plant meets the output improving capacity requirement, and if not, returning to the step S1 to modify the set output improving capacity of the steam turbine. The method can evaluate the output improvement level of the steam turbine in real time, and has strong timeliness.
Description
Technical Field
The invention relates to the technical field of nuclear power plant reactors, in particular to a method for evaluating the output lifting capacity of a steam turbine in a nuclear power plant.
Background
The reactor power improvement is an important project in the transformation of a nuclear power unit, can increase the generating capacity and improve the economy, and is the most important means for keeping long-term efficient economic operation. The reactor power boost is subject to many factors, and for a loop nuclear island, the reactor power boost mainly depends on conservative allowance considered in the initial design stage of a power plant; for a two-loop conventional island, a steam turbine set is a key device, and the output capacity of the steam turbine set directly determines the magnitude of output electric power.
At present, if the output improvement evaluation of the steam turbine unit is required, the operation data of a power plant and the required improvement capacity are fed back to a steam turbine manufacturer, and the manufacturer can obtain the conclusion whether the output improvement of the steam turbine is feasible or not through detailed demonstration. This process involves a large number of data iterations and departmental communication, which is tedious and time consuming.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for evaluating the output lifting capacity of a steam turbine in a nuclear power plant, which can evaluate the output lifting level of the steam turbine in real time and has strong timeliness.
The invention provides a method for evaluating the output lifting capacity of a steam turbine in a nuclear power plant, which comprises the following steps:
step S1, setting the output lifting capacity of a steam turbine, wherein the lifting capacity is less than or equal to the valve full-opening output of the steam turbine;
step S2, according to the set turbine output lifting capacity and the turbine output lifting principle, predicting the change of a plurality of key parameters of the steam generator and the turbine related to the lifting principle when the output lifting capacity is realized;
step S3, analyzing the conditions which need to be met by other key parameters of the steam generator and the steam turbine related to the lifting principle according to the change of the key parameters estimated in the step S2;
and step S4, judging whether the values of the other parameters of the steam generator and the steam turbine obtained by calculation according to the actual operation data of the power plant meet the conditions analyzed in the step S3, if so, indicating that the actual operation state of the power plant meets the output improving capacity requirement, and if not, returning to the step S1 to modify the set output improving capacity of the steam turbine.
The output of the steam turbine is improved according to the principle that the throttling pressure drop is reduced by opening the high-pressure regulating valve, and the inlet pressure of the steam turbine is improved, so that the steam flow passing through the steam turbine is increased.
Wherein the plurality of key parameters in step S2 include steam generator outlet pressure, turbine inlet first stage pressure, and turbine through-flow steam;
the step S2 of estimating changes of a plurality of key parameters of the steam generator and the steam turbine related to the lifting principle when the output lifting capacity is realized includes:
and when the output improving capacity is predicted to be realized, the reduced value of the outlet pressure of the steam generator, the increased value of the first-stage pressure of the turbine inlet and the increased value of the through-flow steam of the turbine are predicted.
Wherein, the other key parameters in the step S3 include the opening X% of the high-pressure regulating valve at the inlet of the steam turbine when the power of 100% FP is running;
the step S3 may specifically include:
and analyzing the conditions to be met by the opening X% of the high-pressure regulating valve at the inlet of the steam turbine when the power of 100% FP is running according to the estimated reduction value of the outlet pressure of the steam generator, the increase value of the first-stage pressure at the inlet of the steam turbine and the increase value of the steam flowing through the steam turbine in the step S2.
Wherein the output boost capability is expressed in percent increments.
In step S1, the turbine power take-off capacity is set to the maximum core power take-off.
By adopting the technical scheme, the output improvement level of the steam turbine can be evaluated in real time, and the timeliness is extremely strong.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of one embodiment of a method of evaluating turbine power boost capability at an operating nuclear power plant in accordance with the present invention.
FIG. 2 is a graph of a plurality of key parameters of the steam generator and the steam turbine predicted based on capacity for capacity lift.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
FIG. 1 is a schematic flow diagram of one embodiment of a method of evaluating turbine power boost capability at an operating nuclear power plant in accordance with the present invention. As shown in fig. 1, the method of the present invention may comprise:
step S1, setting the output lifting capacity of the steam turbine, wherein the lifting capacity is less than or equal to the valve full-open output of the steam turbine.
In some embodiments, at step S1, the turbine capacity is set to a maximum core lift power.
And step S2, estimating the change of a plurality of key parameters of the steam generator and the steam turbine related to the lifting principle when the output lifting capacity is realized according to the set output lifting capacity of the steam turbine and the output lifting principle of the steam turbine.
In some embodiments, the turbine output boost concept includes increasing the steam flow through the turbine by opening a high pressure regulating valve to reduce the throttling pressure drop and increase the turbine inlet pressure. Therefore, in step S2, the plurality of key parameters include a steam generator outlet pressure, a turbine inlet first stage pressure, and a turbine through-flow steam, and step S2 is specifically configured to predict a decrease value of the steam generator outlet pressure, an increase value of the turbine inlet first stage pressure, and an increase value of the turbine through-flow steam when the output boost capability is achieved.
For example, in the embodiment of fig. 2, the evolution process of the steam generator and turbine operating parameters is analyzed by taking the example of a turbine power output power increase of 1.6%, i.e., P1 ═ 1.6%. Several key parameter changes were obtained by analysis: the SG outlet pressure is reduced by 0.04MPa, the first-stage pressure of the steam turbine inlet is increased by 0.06MPa, the opening of a high-pressure regulating valve of the steam turbine inlet needs to be increased, and the through-flow steam of the steam turbine is increased by 1.7%.
And step S3, analyzing the conditions required to be met by other key parameters of the steam generator and the steam turbine related to the lifting principle according to the change of the key parameters estimated in the step S2.
Also taking the example of the steam turbine power output increase of 1.6%, that is, the case where P1 is 1.6%, in fig. 2, the condition that the opening X% of the turbine inlet high-pressure regulating valve satisfies when the power is at 100% FP is analyzed in step S3. The analysis steps are as follows:
Δ P-1 > (. DELTA.P-. DELTA.P 1) 1.0172 +. DELTA.P 2, wherein:
Δ P: SG outlet and turbine inlet differential pressure under 100% FP
Δ P-1: SG outlet and turbine inlet differential pressure under 101.6% FP
Δ P1: throttle pressure drop at 100% FP on-site valve opening
Δ P2: the throttle pressure drop is 1.7bar under the condition that the valve is opened at 100 percent
Continuing the derivation to yield:
Δ P1 > (0.04 × Δ P +2.7)/1.04, wherein:
Δ P: SG outlet and turbine inlet differential pressure under 100% FP
Δ P1: throttle pressure drop at 100% FP on-site valve opening
According to the output regulation principle of the steam turbine and the relation between the valve opening and the throttling pressure drop, the following can be obtained by continuous derivation:
X％＜Xlimit％
-X%: 100% FP on-site valve opening
-Xlimit%: (0.04 × Δ P +2.7)/1.04 corresponds to the opening degree
Δ P: SG outlet and turbine inlet differential pressure under 100% FP
The 'X% < Xlimit%' is the condition that X% of the opening degree of the high-pressure regulating valve at the inlet of the steam turbine needs to meet when 100% FP power is operated before the output of the steam turbine is improved by 1.6%.
And step S4, judging whether the values of the other parameters of the steam generator and the steam turbine obtained by calculation according to the actual operation data of the power plant meet the conditions analyzed in the step S3, if so, indicating that the actual operation state of the power plant meets the output improving capacity requirement, and if not, returning to the step S1 to modify the set output improving capacity of the steam turbine.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. A method of assessing the lift capacity of a turbine in a nuclear power plant, comprising:
step S1, setting the output lifting capacity of a steam turbine, wherein the lifting capacity is less than or equal to the valve full-opening output of the steam turbine;
step S2, according to the set turbine output lifting capacity and the turbine output lifting principle, predicting the change of a plurality of key parameters of the steam generator and the turbine related to the lifting principle when the output lifting capacity is realized; the plurality of key parameters comprise steam generator outlet pressure, turbine inlet first-stage pressure and turbine through-flow steam;
step S3, analyzing the conditions which need to be met by other key parameters of the steam generator and the steam turbine related to the lifting principle according to the key parameter change estimated in the step S2; the other key parameters comprise the opening X% of a high-pressure regulating valve at the inlet of the steam turbine when the power of 100% FP is running;
and step S4, judging whether the values of the other key parameters of the steam generator and the steam turbine obtained by calculation according to the actual operation data of the power plant meet the conditions analyzed in the step S3, if so, indicating that the actual operation state of the power plant meets the output improving capacity requirement, and if not, returning to the step S1 to modify the set output improving capacity of the steam turbine.
2. The method of evaluating the turbine power boost capability of an operating nuclear power plant according to claim 1, wherein said turbine power boost concept comprises increasing the steam flow through the turbine by opening the high pressure regulating valve to reduce the throttling pressure drop and increase the turbine inlet pressure.
3. The method for estimating the power take-off capability of a steam turbine at a nuclear power plant according to claim 2, wherein the step S2 of estimating changes of a plurality of key parameters of the steam generator and the steam turbine involved in the lifting principle when the power take-off capability is realized comprises the steps of:
and when the output improving capacity is predicted to be realized, the reduced value of the outlet pressure of the steam generator, the increased value of the first-stage pressure of the turbine inlet and the increased value of the through-flow steam of the turbine are predicted.
4. The method for evaluating the power takeoff capacity of a steam turbine at an operating nuclear power plant according to claim 3, wherein the step S3 specifically comprises:
and analyzing the conditions to be met by the opening X% of the high-pressure regulating valve at the inlet of the steam turbine when the power of 100% FP is operated according to the estimated reduction value of the outlet pressure of the steam generator, the estimated increase value of the first-stage pressure at the inlet of the steam turbine and the estimated increase value of the steam flowing through the steam turbine in the step S2.
5. The method of assessing the power take-off capability of a steam turbine at an operating nuclear power plant according to any one of claims 1 to 4, wherein the power take-off capability is expressed in percent increments.
6. The method for evaluating the turbine power take-off capability of an operating nuclear power plant according to any one of claims 1 to 4, wherein in the step S1, the turbine power take-off capability is set to the maximum core lifting power.
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